RESUMOO rio Puraquequara, e seu afluente direito, o igarapé Água Branca, localizam-se fora da zona urbana de Manaus e estão com a bacia ainda protegida por floresta primária. Têm características geológicas, pedológicas e climatológicas de igarapés naturais de terrafirme da Amazônia Central. PALAVRAS CHAVEÁguas naturais, rios da Amazônia, águas pretas, parâmetros físicos. Contribution to the hydrochemistry of drainages in the municipality of Manaus-Am ABSTRACT The Puraquequara River and its right-bank's tributary, the Água Branca stream, are located in the outskirts of the Manaus urbanized area and their basin is still harbored by the primary rain forest cover. They exhibit 'terra firme' geologic, pedologic and climatological characteristics pertaining to the Amazonian region. Samples for this research were collected in November 1998 (dry season) and April 1999 (rainy season KEYWORDSNatural waters, Amazonian river, black water, physical and chemical parameters.
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